Implantable medical device with MRI and gradient field induced capture detection methods

摘要

An implantable medical device is provided having a telemetry circuit antenna; a lead having an elongated body for carrying a conductor extending from a proximal connector to a distal electrode; a circuit for measuring voltage induced on the telemetry circuit antenna and generating an antenna voltage signal corresponding to the measured voltage on the antenna; a circuit for measuring voltage induced on the lead conductor and generating a lead voltage signal corresponding to the measured voltage on the lead; and processing circuitry for receiving the antenna voltage signal and the lead voltage signal and for generating an MRI detection signal if the antenna voltage signal and the lead voltage signal meet an MRI detection requirement. The device further includes control circuitry for providing a safeguard response to the MRI detection signal.